A queue is a useful data structure in programming. It is similar to the ticket queue outside a cinema hall, where the first person entering the queue is the first person who gets the ticket.
There are four different types of queue in data structure. Let's discuss them below.
In a simple queue, insertion takes place at the rear and removal occurs at the front. It strictly follows FIFO rule.
Please visit queue to learn more about a simple queue and its implementation in different programming languages.
In a circular queue, the last element points to the first element making a circular link.
The main advantage of a circular queue over a simple queue is better memory utilization. If the last position is full and the first position is empty then, an element can be inserted in the first position. This action is not possible in a simple queue.
Please visit circular queue to learn more about the circular queue.
A priority queue is a special type of queue in which each element is associated with a priority and is served according to its priority. If elements with the same priority occur, they are served according to their order in the queue.
Insertion occurs based on the arrival of the values and removal occurs based on priority.
Please visit priority queue to learn more about priority queue.
Double Ended Queue or Deque
Double Ended Queue is a type of queue in which insertion and removal of elements can be performed from either from the front or rear. Thus, it does not follow FIFO rule (First In First Out).
Please visit double ended queue to learn more about double ended queue.